Semi-Sync/Hybrid Delay

So… I’m trying to create a delay which is somewhat synced but not totally for my use with my midi controller…

Basically, I want to make a delay with a delay time scaled to the tempo so that hard left on the knob is no delay (or 1 ms), dead center is a 1/2 bar delay, and hard right is a full bar… but instead of jumping from each synced interval, it would be a smooth transition.

I’ve been poking at this idea for a week or so and can’t seem to figure it out. I’m sure there is some simple way I’m overlooking… but right now it’s driving me nuts…